@Misc{ 
  GhiGobRov17,
  author = { Ghisi, Marina and Gobbino, Massimo and Rovellini, Giulio },
  title = { Symmetry-breaking in a generalized Wirtinger inequality },
  journal = {  },
  year = { 2017 },
  pages = {  },
  URL = { http://cvgmt.sns.it/paper/3540/ },
  note = { cvgmt preprint}
}